/*
 * This file is part of wl1271
 *
 * Copyright (C) 2008-2009 Nokia Corporation
 *
 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include "wl1271.h"
#include "wl1271_reg.h"
#include "wl1271_spi.h"
#include "wl1271_event.h"
#include "wl1271_ps.h"
#include "wl12xx_80211.h"

static int wl1271_event_scan_complete(struct wl1271 *wl,
				      struct event_mailbox *mbox)
{
	int size = sizeof(struct wl12xx_probe_req_template);
	wl1271_debug(DEBUG_EVENT, "status: 0x%x",
		     mbox->scheduled_scan_status);

	if (wl->scanning) {
		if (wl->scan.state == WL1271_SCAN_BAND_DUAL) {
			wl1271_cmd_template_set(wl, CMD_TEMPL_CFG_PROBE_REQ_2_4,
						NULL, size);
			/* 2.4 GHz band scanned, scan 5 GHz band, pretend
			 * to the wl1271_cmd_scan function that we are not
			 * scanning as it checks that.
			 */
			wl->scanning = false;
			wl1271_cmd_scan(wl, wl->scan.ssid, wl->scan.ssid_len,
						wl->scan.active,
						wl->scan.high_prio,
						WL1271_SCAN_BAND_5_GHZ,
						wl->scan.probe_requests);
		} else {
			if (wl->scan.state == WL1271_SCAN_BAND_2_4_GHZ)
				wl1271_cmd_template_set(wl,
						CMD_TEMPL_CFG_PROBE_REQ_2_4,
						NULL, size);
			else
				wl1271_cmd_template_set(wl,
						CMD_TEMPL_CFG_PROBE_REQ_5,
						NULL, size);

			mutex_unlock(&wl->mutex);
			ieee80211_scan_completed(wl->hw, false);
			mutex_lock(&wl->mutex);
			wl->scanning = false;
		}
	}
	return 0;
}

static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
{
	wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
	wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
	wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
}

static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
{
	int ret;
	u32 vector;

	wl1271_event_mbox_dump(mbox);

	vector = le32_to_cpu(mbox->events_vector);
	vector &= ~(le32_to_cpu(mbox->events_mask));
	wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);

	if (vector & SCAN_COMPLETE_EVENT_ID) {
		ret = wl1271_event_scan_complete(wl, mbox);
		if (ret < 0)
			return ret;
	}

	/*
	 * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
	 * filtering) is enabled. Without PSM, the stack will receive all
	 * beacons and can detect beacon loss by itself.
	 */
	if (vector & BSS_LOSE_EVENT_ID && wl->psm) {
		wl1271_debug(DEBUG_EVENT, "BSS_LOSE_EVENT");

		/* indicate to the stack, that beacons have been lost */
		ieee80211_beacon_loss(wl->vif);
	}

	return 0;
}

int wl1271_event_unmask(struct wl1271 *wl)
{
	int ret;

	ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
	if (ret < 0)
		return ret;

	return 0;
}

void wl1271_event_mbox_config(struct wl1271 *wl)
{
	wl->mbox_ptr[0] = wl1271_spi_read32(wl, REG_EVENT_MAILBOX_PTR);
	wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);

	wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
		     wl->mbox_ptr[0], wl->mbox_ptr[1]);
}

int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num, bool do_ack)
{
	struct event_mailbox mbox;
	int ret;

	wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);

	if (mbox_num > 1)
		return -EINVAL;

	/* first we read the mbox descriptor */
	wl1271_spi_read(wl, wl->mbox_ptr[mbox_num], &mbox,
			sizeof(struct event_mailbox), false);

	/* process the descriptor */
	ret = wl1271_event_process(wl, &mbox);
	if (ret < 0)
		return ret;

	/* then we let the firmware know it can go on...*/
	if (do_ack)
		wl1271_spi_write32(wl, ACX_REG_INTERRUPT_TRIG,
				   INTR_TRIG_EVENT_ACK);

	return 0;
}